Isn't the "free market" great!
No disrespect to Andrew but I'd like a few more specifics before I freak out.
Told by whom?
What does it mean to have a phone number (and more!) blacklisted by Visa?
Did he use his home address, phone, etc. as his business info for Gab previously?
If they can do this to me, they can do it to you and they likely will.
Yes, they're a private company and they can choose who to do business with provided they honor their contracts (and civil rights laws). In 99.99% of the cases I'm not sure why they would, however.